RSS Auto-discovery. Thinking out loud:

RSS Auto-discovery. Thinking out loud: "What are the alternatives available for leveraging work done by others in RSS auto discovery?" In other words, given the human-meaninful URL for a blog site, what is the URL for the corresponding RSS file? I know this problem has been discussed a lot, and solved in many different places. It certainly would make sense if there was either an open source utility library or a web service. If there isn't one, and I end up developing one, I will publish it either as open source or web service.